I'm using a dried starter that my dad sent me 12 years ago. I've been feeding it for 2 weeks now and I've never seen it double. It has gotten more bubbly over time, though. It looks like the "5 hours later" picture except that I don't see anything moving, in slow motion or otherwise. Should I just keep feeding it? Is it too old to revive? It is fairly cold where I am, so maybe when temperatures get above 70 it will do better?

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